反应详情

To a mixture of sodium hydroxide (112 g, 2.8 mol) in THF (1200 mL) and EtOH (1800 mL) was added ethyl 3-(tert-butoxycarbonyl(methyl)amino)propanoate (300 g, 1.4 mol). The resulting mixture was stirred for 3 h. The mixture was diluted with water (1000 mL) and evaporated to remove volatiles. The water phase was washed with CH2Cl2 (800 mL×3). The inorganic layer was cooled in an ice bath and acidified with 1 N HCl until the pH was adjusted to 1-2. CH2Cl2 (1000 mL×4) was quickly added to extract the product acid. The organic phase was dried over anhydrous Na2SO4 and concentrated to give 3-(tert-butoxycarbonyl(methyl)amino)propanoic acid (208 g, 73.2%) as oil, which was used in the next step without further purification.

1. customevaporated
2. customto remove volatiles
3. washThe water phase was washed with CH2Cl2 (800 mL×3)
4. temperatureThe inorganic layer was cooled in an ice bath
5. additionCH2Cl2 (1000 mL×4) was quickly added
6. extractionto extract the product acid
7. dry with materialThe organic phase was dried over anhydrous Na2SO4
8. concentrationconcentrated